heatherbell



v P. E. AND G. G. HEATHERBELL.

MR INDUCTION APPARATUS. APPLICATION HLED JAN. 26, m5. RENEWED JULY 1. m9.

1,323,981 Patented Dec. 2,1919.

attain 4 n 1 rn srrArns PATENT nron. 1

I PERCY E. 'HEATHERBELL, OF DEEP BAY, AND GORDON G. HEATHER/BELL, OF PORT i GYGNET, TASMANIA, AUSTRALIA. v

AIR-INDUCTION ArrAneTUs.

Application filedfJ'anuary as, 1915, Serial in). 4,525.

To all whom it may concern:

Be it known that we, PERCY E. HEATHER- BELL and GORDON Gr. HEATH RBELL, both subjects of'the King of Great Britain, residing at Deep Bay and Port Cygnet, in the State of Tasmania and Commonwealth of Australia, have invented certain new and useful Improvements in Air-Induction paratus, of which the following is a speci cation. v

Our invention relates to impelling apparatus for ducts and is principally designed for use in chimneys or stacks leading from stoves and furnaces, for operation to induce and increase the draft for the fires within the stoves and furnaces.

With the-foregoing end in view, the invention relates to a novel construction, arrangement and combination of durable parts designed toeffectively accomplish the function stated and for manu'facture at low cost. Definite objects with respect to auxiliary functions are to provide apparatus of this nature having one or more blades, preferably pivoted oif center, which will normally seek the vertical so as not to obstruct the draft while at rest; effective means forming an abutment to prevent rotation of the blades by impingement of the air against them and manually operable means to positively drive said means.

Additionalobjects will hereinafter appear from the description following taken in connection with accompanying drawings wherein the preferred embodiment is illustrated.

In said drawings Figure 1 is a view showing our improved apparatus in elevation and in connection with a stove pipe, the latter being partly in elevation and partly in section;

Fig. 2 is a cross sectional view on the line 22 of Fig. 1;

Fig. 3 is a perspective view of the bladesupporting bracket, and

Fig. 4 is a detail sectional view on the line 4-4: of Fig. 1.

Referring specifically to the drawings wherein like reference characters designate like or similar parts, a duct is shown at 1 which is a stove pipe section of thin metal and round in cross section. Interiorly of the duct 1 are mounted suitable bearing bars 2 which at their ends have angle lugs 3 through which pass removable fastening.

bolts A, and which bolts removably pass Specification of Letters Patent.

. ments 12 forming stops.

Renewed m 7, 1919. seiin No. 309,182.

through the wall of duct 1, to secure the bearing bars in place. Journaled in the bearing bars 2 is a longitudinally extending shaft 5 which has a square portion 6. A suitablebracket 7 is fastened to the shaft 5. This bracket comprises a' collar 8 and 0pposed arms 11 terminating in oblique abut- The collar 8 has a square opening 9 to receive a square portion 6 of the shaft 5, a screw 10 threaded in a side of the collar serving to secure the bracket to the shaft. The abutments or stops 12 incline laterally in opposite directions and limit the movements of the blades 13 in one direction. Blades 13 are pivotally mounted on the arms 11 by means of cleats 141,01? center, so that the greatest area of theblades longitudinally of shaft 5 will be above the arms 11. Tothe blades 13 are suitably fastened at proper desired locations, weights 1% which serve to normally maintain the blades in a vertical position and to cause the blades to seek a vertical position after an operation. Specifically these weights are shown as fastened at the lower edge of the blades and on the sides thereof to which the arms 11 are fastened.

A bevel gear wheel 15 is keyed or otherwise fastened to the shaft 5 below the lowermost bearing bar 2. Meshing with the bevel gear wheel 15, is a bevel gear wheel 16, preferably of greater diameter, which is mounted on a shaft 17 having a crank 18 at one end on which is turnably mounted a handle 19 of wood, metal or the duct or pipe 1 thereby increasing the draft, in the stove, furnace or the equivalent, from which the duct or pipe, leads. As previouslystated, the weights 14f maintain the blades 13 in a vertical position while at rest. However when shaft 5 turns, by the Patented Dec. 2, 1919;

impingement of the air against the blades or plates, they contact with the abutments 12 which serve to support them in angular positions, and at different angles to each phere can turn the blades against the abut:- ments 12. This overcomes the liability of "the blades overturning or being turned in the counter direction by the atmosphere during horizontal rotation, as less air-impinging surface is provided below than above the axis of the arms 11.

While our improvements relate particularly to a'means to increase the draft in ducts or pipes leading from stoves and furnaces, it is nevertheless capable of use for other purposes, for instance, stirring and mixing various materials, and as a fan, and hence limitation to a special use is not to be inferred. Also'changes in the details of construction, combination and arrangement of the parts may be resorted to Without devention.

,Having thus described our invention, What We claim is v1. In apparatus of the character specified, a duct, a shaft j ournaled longitudinally of the duct, a bracketvrotatable Withthe shaft and comprising arms extending 0ut- Wardly from the shaft and across the duct and provided With stop extensions, blades parting from the spirit and scope of thempivotally mounted on the arms and present ing unequal surfaces" on opposite sides of their respective axes and limited in their pivotal movements in one direction byflthe said stop extensions and normally occupying a vertlcalposition, and means for 1mparting a rotary movement to the saidshaft.

2. In combination, a vertical duct,=s-up-, porting members secured Withinithe duct, the one above the other, a centrally disposed shaft journaled in' the supporting members,

a bracket secured to the shaft and having 7 opposed arms provided at" their outer ends.

with oblique extensions;formingjabutments,

blades pivotally mounted upon the armsand Weightedat their lower edges to normally hold the blades "in vertical position, the blades presentlng a greater area above their supporting arms andflimitedin their pivotal, V

movements in one direction'by the said abut ments, and a horizontalshaft mounted in the-v duct and geared to the centrally disposed shaft and adapted 'to have povverapplied to a projecting end thereof" I In testimony whereof We afiix our signatures in presence of two Witnesses. V

PERCY EJ'HEATHERBELLL s GORDON' G. HEATHERBELL.

" Witnesses: s

O. TH nLw I GEO. Hm THERBELL. 

